erratic idle

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bill75

NAXJA Forum User

Location

dunmore,pa

• Aug 16, 2003

• #1

my 94 xj idles erratically mainly when cold. sometimes at a stop
the engine lopes. took it to garage they changed the distributor cap and rotor didnt work then they changed crank sensor still nothing. now they want change fuel pump and filter. can anyone help me diagnose the problem.

 

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Runnin'OnEmpty

NAXJA Forum User

Location

Southeast USA

• Aug 17, 2003

• #2

Bill, try cleaning the throttle body, in the area where the throttle plate meets with the bore. Carbon deposits tend to build up there, and result in an erratic idle.

 

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Judd W. VA

NAXJA Forum User

Location

new Hope, Va

• Aug 17, 2003

• #3

I would also give the shop some crap for 'replacement diagnosis'!! Just to replace stuff hoping to correct a problem is not the way to do it!! Don't go back there-

 

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bill75

NAXJA Forum User

Location

dunmore,pa

• Sep 3, 2003

• #4

thnk for the response. the tthrottle body was dirty cleaned it seems to be running better. thnx.

 

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XJ-ARMOR

NAXJA Forum User

Location

NORCAL

• Sep 10, 2003

• #5

Poor O2 sensor reading may also cause a rich/lean condition which can cause the problem you describe. Maybe time for a new O2 if its been many miles since the last change. -Steve

 

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xjwoody

NAXJA Forum User

Location

Suburban Philadelphia

• Sep 10, 2003

• #6

Cherokee America has a good article on cleaning the theottle body
http://www.off-road.com/jeep/cherokee/xjtech/engine/tbody.htm
You need to replace the O2 sensor, too. Don't even think about it... just do it.